'Except' in the Bible

What shall we say then? Is the law sin? God forbid. Howbeit, I had not known sin, except through the law: for I had not known coveting, except the law had said, Thou shalt not covet:

And, as Isaiah hath said before, Except the Lord of Sabaoth had left us a seed, We had become as Sodom, and had been made like unto Gomorrah.

and how shall they preach, except they be sent? even as it is written, How beautiful are the feet of them that bring glad tidings of good things!